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Date: Tue, 27 Sep 2011 22:06:33 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: tom.leiming@...il.com, rostedt@...dmis.org
Cc: stern@...land.harvard.edu, linux-pm@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org, mingo@...hat.com, fweisbec@...il.com,
Ming Lei <ming.lei@...onical.com>
Subject: Re: [PATCH v1 1/2] PM/runtime: introduce trace points for tracing rpm_* functions
On Tuesday, September 27, 2011, tom.leiming@...il.com wrote:
> From: Ming Lei <ming.lei@...onical.com>
>
> This patch introduces 3 trace points to prepare for tracing
> rpm_idle/rpm_suspend/rpm_resume functions, so we can use these
> trace points to replace the current dev_dbg().
>
> Cc: Steven Rostedt rostedt@...dmis.org
> Signed-off-by: Ming Lei <ming.lei@...onical.com>
> ---
> v1: takes Steven's suggestions
> - use __assign_str to dump device name to trace buffer
> - pass _THIS_IP_ to trace_rpm_return_int
Steven, do the patches look good to you now?
Rafael
> ---
> include/trace/events/rpm.h | 99 ++++++++++++++++++++++++++++++++++++++++++++
> kernel/trace/Makefile | 1 +
> kernel/trace/rpm-traces.c | 21 +++++++++
> 3 files changed, 121 insertions(+), 0 deletions(-)
> create mode 100644 include/trace/events/rpm.h
> create mode 100644 kernel/trace/rpm-traces.c
>
> diff --git a/include/trace/events/rpm.h b/include/trace/events/rpm.h
> new file mode 100644
> index 0000000..36805d9
> --- /dev/null
> +++ b/include/trace/events/rpm.h
> @@ -0,0 +1,99 @@
> +
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM rpm
> +
> +#if !defined(_TRACE_RUNTIME_POWER_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_RUNTIME_POWER_H
> +
> +#include <linux/ktime.h>
> +#include <linux/tracepoint.h>
> +#include <linux/device.h>
> +
> +/*
> + * The rpm_internal events are used for tracing some important
> + * runtime pm internal functions.
> + */
> +DECLARE_EVENT_CLASS(rpm_internal,
> +
> + TP_PROTO(struct device *dev, int flags),
> +
> + TP_ARGS(dev, flags),
> +
> + TP_STRUCT__entry(
> + __string( name, dev_name(dev) )
> + __field( int, flags )
> + __field( int , usage_count )
> + __field( int , disable_depth )
> + __field( int , runtime_auto )
> + __field( int , request_pending )
> + __field( int , irq_safe )
> + __field( int , child_count )
> + ),
> +
> + TP_fast_assign(
> + __assign_str(name, dev_name(dev));
> + __entry->flags = flags;
> + __entry->usage_count = atomic_read(
> + &dev->power.usage_count);
> + __entry->disable_depth = dev->power.disable_depth;
> + __entry->runtime_auto = dev->power.runtime_auto;
> + __entry->request_pending = dev->power.request_pending;
> + __entry->irq_safe = dev->power.irq_safe;
> + __entry->child_count = atomic_read(
> + &dev->power.child_count);
> + ),
> +
> + TP_printk("%s flags-%x cnt-%-2d dep-%-2d auto-%-1d p-%-1d"
> + " irq-%-1d child-%d",
> + __get_str(name), __entry->flags,
> + __entry->usage_count,
> + __entry->disable_depth,
> + __entry->runtime_auto,
> + __entry->request_pending,
> + __entry->irq_safe,
> + __entry->child_count
> + )
> +);
> +DEFINE_EVENT(rpm_internal, rpm_suspend,
> +
> + TP_PROTO(struct device *dev, int flags),
> +
> + TP_ARGS(dev, flags)
> +);
> +DEFINE_EVENT(rpm_internal, rpm_resume,
> +
> + TP_PROTO(struct device *dev, int flags),
> +
> + TP_ARGS(dev, flags)
> +);
> +DEFINE_EVENT(rpm_internal, rpm_idle,
> +
> + TP_PROTO(struct device *dev, int flags),
> +
> + TP_ARGS(dev, flags)
> +);
> +
> +TRACE_EVENT(rpm_return_int,
> + TP_PROTO(struct device *dev, unsigned long ip, int ret),
> + TP_ARGS(dev, ip, ret),
> +
> + TP_STRUCT__entry(
> + __string( name, dev_name(dev))
> + __field( unsigned long, ip )
> + __field( int, ret )
> + ),
> +
> + TP_fast_assign(
> + __assign_str(name, dev_name(dev));
> + __entry->ip = ip;
> + __entry->ret = ret;
> + ),
> +
> + TP_printk("%pS:%s ret=%d", __entry->ip, __get_str(name),
> + __entry->ret)
> +);
> +
> +#endif /* _TRACE_RUNTIME_POWER_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>
> diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
> index 761c510..56bdab5 100644
> --- a/kernel/trace/Makefile
> +++ b/kernel/trace/Makefile
> @@ -53,6 +53,7 @@ endif
> obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
> obj-$(CONFIG_KPROBE_EVENT) += trace_kprobe.o
> obj-$(CONFIG_TRACEPOINTS) += power-traces.o
> +obj-$(CONFIG_TRACEPOINTS) += rpm-traces.o
> ifeq ($(CONFIG_TRACING),y)
> obj-$(CONFIG_KGDB_KDB) += trace_kdb.o
> endif
> diff --git a/kernel/trace/rpm-traces.c b/kernel/trace/rpm-traces.c
> new file mode 100644
> index 0000000..998949e
> --- /dev/null
> +++ b/kernel/trace/rpm-traces.c
> @@ -0,0 +1,21 @@
> +/*
> + * Power trace points
> + *
> + * Copyright (C) 2009 Ming Lei <ming.lei@...onical.com>
> + */
> +
> +#include <linux/string.h>
> +#include <linux/types.h>
> +#include <linux/workqueue.h>
> +#include <linux/sched.h>
> +#include <linux/module.h>
> +#include <linux/usb.h>
> +
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/rpm.h>
> +
> +EXPORT_TRACEPOINT_SYMBOL_GPL(rpm_return_int);
> +EXPORT_TRACEPOINT_SYMBOL_GPL(rpm_idle);
> +EXPORT_TRACEPOINT_SYMBOL_GPL(rpm_suspend);
> +EXPORT_TRACEPOINT_SYMBOL_GPL(rpm_resume);
> +
>
--
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